题目内容：

根据短文意思和所给首字母，写出一个完整正确的单词。

We need friends when we play and work. If we have friends, we'll feel happy. If we have no friends, we will feel 1. l_____. But what is Forever Friend? When you're down, and the world 2. s_____ dark and empty, your forever friend cheers you 3. u_____ and makes that world suddenly seem bright and full. Your forever friend gets you 4.t_____ the hard times and the sad times. If you turn and walk away, your forever friend follows. If you lose your 5. w_____, your forever friend guides you and cheers you on. Your forever friend holds your hand and tells you that everything is going to be okay.